膨(peng)脹節習(xi)慣上(shang)(shang)也叫補(bu)償(chang)器(qi)(qi)，或伸(shen)縮節。由構成其工作(zuo)(zuo)主(zhu)體的(de)波紋(wen)管(guan)(guan)(guan)(guan)(一(yi)種彈性元件(jian))和端管(guan)(guan)(guan)(guan)、支(zhi)架、法(fa)蘭、導管(guan)(guan)(guan)(guan)等附(fu)件(jian)組成。 膨(peng)脹節是(shi)為了補(bu)償(chang)因溫度(du)差與機械振動引起的(de)附(fu)加應(ying)力，而(er)設(she)置(zhi)在容(rong)(rong)器(qi)(qi)殼體或管(guan)(guan)(guan)(guan)道上(shang)(shang)的(de)一(yi)種撓性結(jie)構。利(li)用其工作(zuo)(zuo)主(zhu)體波紋(wen)管(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)縮變形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)(rong)器(qi)(qi)等由熱(re)脹冷縮等原因而(er)產生的(de)尺(chi)寸(cun)變化(hua)，或補(bu)償(chang)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)(rong)器(qi)(qi)等的(de)軸向、橫(heng)向和角向位移。也可用于(yu)降噪減(jian)(jian)振。供(gong)熱(re)上(shang)(shang)，為了防(fang)止供(gong)熱(re)管(guan)(guan)(guan)(guan)道升溫時，由于(yu)熱(re)伸(shen)長或溫度(du)應(ying)力而(er)引起管(guan)(guan)(guan)(guan)道變形或破壞，需要在管(guan)(guan)(guan)(guan)道上(shang)(shang)設(she)置(zhi)補(bu)償(chang)器(qi)(qi)，以補(bu)償(chang)管(guan)(guan)(guan)(guan)道的(de)熱(re)伸(shen)長，從而(er)減(jian)(jian)小管(guan)(guan)(guan)(guan)壁的(de)應(ying)力和作(zuo)(zuo)用在閥件(jian)或支(zhi)架結(jie)構上(shang)(shang)的(de)作(zuo)(zuo)用力。